From 61fb192a1cf87413e19f565495595c8c116d7c10 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Wed, 15 May 2013 17:25:03 -0400 Subject: [PATCH] drm/radeon/dpm: add a helper to encode pcie lane setting convert from number of lanes to register setting. Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/r600_dpm.c | 10 ++++++++++ drivers/gpu/drm/radeon/r600_dpm.h | 1 + 2 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c index 34ea5d6..89c46c5 100644 --- a/drivers/gpu/drm/radeon/r600_dpm.c +++ b/drivers/gpu/drm/radeon/r600_dpm.c @@ -1246,3 +1246,13 @@ u16 r600_get_pcie_lane_support(struct radeon_device *rdev, return 16; } } + +u8 r600_encode_pci_lane_width(u32 lanes) +{ + u8 encoded_lanes[] = { 0, 1, 2, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 6 }; + + if (lanes > 16) + return 0; + + return encoded_lanes[lanes]; +} diff --git a/drivers/gpu/drm/radeon/r600_dpm.h b/drivers/gpu/drm/radeon/r600_dpm.h index 71d5d93..8dc1fbd 100644 --- a/drivers/gpu/drm/radeon/r600_dpm.h +++ b/drivers/gpu/drm/radeon/r600_dpm.h @@ -227,5 +227,6 @@ enum radeon_pcie_gen r600_get_pcie_gen_support(struct radeon_device *rdev, u16 r600_get_pcie_lane_support(struct radeon_device *rdev, u16 asic_lanes, u16 default_lanes); +u8 r600_encode_pci_lane_width(u32 lanes); #endif -- 2.7.4